A ban on students using smartphones took effect Tuesday in the Los Angeles Unified School District. The nation’s second largest school district voted 5-2 in June in favor of the ban on using cellphones,

Cellphones must now be put away or locked away during the school day in the nation's second-largest school system. So far, most students seemed to be complying.

When students in the Los Angeles Unified School District return to class after President’s Day, they might want to leave their cell phones at home. A district-wide cell phone ban takes effect on Tuesday.